20396019997 has 2 divisors, whose sum is σ = 20396019998. Its totient is φ = 20396019996.

The previous prime is 20396019989. The next prime is 20396020013. The reversal of 20396019997 is 79991069302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18840033081 + 1555986916 = 137259^2 + 39446^2 .

It is a cyclic number.

It is not a de Polignac number, because 20396019997 - 2³ = 20396019989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20396019197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198009998 + 10198009999.

It is an arithmetic number, because the mean of its divisors is an integer number (10198009999).

Almost surely, 2^20396019997 is an apocalyptic number.

It is an amenable number.

20396019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20396019997 is an equidigital number, since it uses as much as digits as its factorization.

20396019997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1653372, while the sum is 55.

The spelling of 20396019997 in words is "twenty billion, three hundred ninety-six million, nineteen thousand, nine hundred ninety-seven".